CN104221620A - Multi-tangential-flow combined rape threshing, separation and stalk crushing integral device - Google Patents

Abstract

The invention relates to a multi-tangential-flow combined rape threshing, separation and stalk crushing integral device. The device comprises a feeding and preliminary threshing device, a main threshing device, a re-threshing device, a stalk crushing device, a clamping belt loss monitoring device and a notch board clearance adjusting device. The device is applicable to graded threshing of rape which is inconsistently matured, the threshing and separation efficiency is high, the loss is small, and notch board clearance can be adjusted in real time through a feedback system of the clamping belt loss monitoring device. The multi-tangential-flow combined rape threshing, separation and stalk crushing integral device has the advantages that not only can the agricultural mechanical and intelligent level in China be improved, but also the rape harvesting quality can be improved and the market space is wide.

Description

A multi-cut flow combined rapeseed threshing separation and straw crushing integrated device

technical field

The invention relates to a multi-cut flow combined rapeseed threshing separation and straw crushing integrated device and gap adjustment method, which are mainly used in the threshing separation part, threshing gap adjustment device and adjustment method of a full-fed rapeseed combine harvester, belonging to combined harvesting machine intelligent control field.

Background technique

Rapeseed is the oil crop with the largest planting area in my country. The threshing and separation device of the existing rapeseed combine harvester is mainly based on the threshing and separation principle of the rice-wheat combine harvester. The pods are fried, cracked or crushed to separate the rapeseed. Due to the large difference in the maturity and water content of rapeseed during the growth process, the material characteristics of rapeseed and stalks are very different from those of rice and wheat. During threshing and separation, there will be a phenomenon that the rotational speed of the threshing element and the threshing drum is not suitable for rapeseed threshing, resulting in large threshing losses and low production efficiency. On the other hand, if the threshing and separation method of the axial flow drum is used, due to the thick rapeseed stalks, it is not only prone to unsmooth material movement and clogging, but also increases power consumption. The process of rapeseed threshing and separation is the result of the joint action of threshing drum and gravure screen. Therefore, choosing the appropriate threshing method and gravure separation form according to the material characteristics of rapeseed in different periods in the threshing and separation device can improve the effect of threshing and separation.

Efficient and intelligent is the development direction of international advanced combine harvesters. Automatic adjustment of various working parameters according to the operation quality of combine harvesters will help improve harvest quality and harvest efficiency. Compared with foreign countries, the overall automation level of combine harvesters in my country is still low. There is a big gap. The entrainment loss rate is the main index to measure the performance of the threshing separation device. The test found that the adjustment of the threshing gap is one of the key factors affecting the entrainment loss rate. The entrainment loss rate can be controlled by adjusting the threshing gap. At present, the domestic combine harvester threshing gap It mainly depends on changing the diameter of the drum for indirect adjustment. It can be seen that this method of adjusting the threshing gap not only cannot be adjusted in time, but also has a large workload and reduces the harvesting efficiency. At present, no automatic adjustment device for the threshing gap has been reported.

Contents of the invention

The purpose of the present invention is to solve the above-mentioned shortcomings of rapeseed threshing and separation, and to propose a multi-stage threshing, smooth operation, large feeding amount, strong adaptability, and reasonable structure. It is equipped with a real-time automatic adjustment device for the threshing gap.

In order to achieve the above objectives, the technical solution adopted by the present invention is: a multi-cut flow combined rapeseed threshing separation and straw crushing integrated device, which is characterized in that it includes a feeding initial removal device, a main removal device and a re-removal device. The feeding primary take-off device includes a feeding primary take-off wheel (1), the main take-off device includes a bar-type main take-off wheel (4), and the re-take-off device includes a nail-toothed re-take-off wheel (7). The feeding primary take-off wheel (1), the corrugated rod-type main take-off wheel (4) and the nail-tooth type re-take-off wheel (7) are arranged in a ladder shape.

Further, it also includes a straw crushing device. The straw crushing device includes a grass cutting wheel (10). 150mm, the axis of the nail-tooth type re-take-off wheel (7) is 140~180mm higher than the axis of the corrugated rod-type main take-off wheel (4), and the axis of the grass cutting wheel (10) is higher than the spike-tooth type re-take-off wheel (7) The shaft center is 80~120mm.

Further, the diameter of the feeding primary take-off wheel (1) is 400-450 mm, the diameter of the rib-type main take-off wheel (4) is 500-600 mm, and the diameter of the nail-tooth type re-take-off wheel (7) is 400 mm ~450mm, the grass cutting wheel (10) has a diameter of 300~360mm, and the lengths of the four axles are the same, all of which are 600~1000mm.

Further, the feeding primary detachment wheel (1) includes plane feeding teeth (101), the tooth height is 35-45 mm, the tooth width is 30-40 mm, and the axial grid spacing of the primary detachment grid concave plate (2) is 14-45 mm. 18mm; the grooved rod type main pulley (4) includes 8 rows of uniformly distributed grooved rods, the width of the grooved rods is 35~45mm, and the axial grid spacing of the main release grid concave plate (5) is 17~20mm; The take-off wheel (7) includes a nail tooth threshing element with a tooth height of 70-80 mm, and the punching hole of the re-off punching concave plate (8) is a rectangular hole of 18 × 18 mm.

According to claim 2, a multi-cut flow combined rapeseed threshing separation and straw crushing integrated device is characterized in that the rotating speed of the feeding primary decapping wheel (1) is 750~850r/min, and The rotating speed of wheel (4) is 600～700 r/min, and the rotating speed of nail-tooth type re-take off wheel (7) is 900～1000 r/min, and the rotating speed of broken grass cutting wheel (10) is 2600～2800 r/min.

Further, it also includes an entrainment loss monitoring device, the entrainment loss monitoring device includes an entrainment loss sensor (15) and a sensor fixing base (16), and the entrainment loss sensor (15) is installed on the sensor fixing base (16) , the sensor holder (16) is installed on the back-off punching concave plate (8), the entrainment loss sensor (15) adopts an array type PVDF entrainment loss sensor, and the monitoring area of the entrainment loss sensor (15) is, The distance from the geometric center of the entrainment loss sensor (15) to the vertical center plane of the spike-toothed retrip wheel (7) is 180-200 mm, and the distance from the upper surface of the entrainment loss sensor (15) to the retrip The distance between the bottom surface of the punching concave plate (8) is 70-100 mm, and the axial installation position of the entrainment loss sensor (15) is in the middle of the re-off punching concave plate (8);

Further, it also includes a gravure gap adjustment device (17), the entrainment loss monitoring device includes an entrainment loss sensor (15) and a sensor fixing seat (16), the gravure gap adjustment device (17) includes a support beam (1701), The push rod (1702), the roller (1703), the cam (1704) and the camshaft (1705), the gravure gap adjustment device is installed at the tail of the back-off punching concave plate (8), one end of the support beam (1701) and the back-off The punching concave plate (8) is welded together, one end and the push rod (1702) are welded together, the push rod (1702) and the roller (1703) are hinged together, and the roller (1703) is on the cam (1704) Rotating inside the raceway, the cam (1704) drives the camshaft (1705) to rotate through a variable frequency motor, thereby driving the push rod to move up and down to adjust the gap between the threshing concave plates.

Further, the gravure gap of the back-off punching concave plate (8) is adjusted through the feedback system of the entrainment loss monitoring device, and the working steps of the feedback system of the entrainment loss monitoring device are as follows:

Step 1: Feed rapeseed into the multi-cut flow combined rapeseed threshing separation and straw crushing integrated device described in claims 1 to 7, record the threshing gap as , the entrainment loss after threshing and separation is , and fall on the entrainment loss detection device The grain quality above is, is the number of experiments, and the relationship between the threshing gap of the threshing separation device of the combine harvester and the entrainment loss mass after threshing separation is obtained: Establish the relationship between the grain amount in the monitoring area and the total entrainment loss grain amount during threshing separation Relationship:;

Step 2: Simultaneously, and three mathematical models, the relationship between the monitoring amount of the entrainment loss sensor and the threshing gap can be obtained during threshing separation;

Step 3: Determine the appropriate monitoring amount of the grain entrainment loss monitoring sensor during threshing separation, obtain the corresponding threshing gap according to the formula obtained in step 2, and adjust the threshing gap.

The beneficial effects of the present invention are:

1. According to the material characteristics of rapeseed, the threshing method of multi-stage cutting flow combination is adopted, and the initial feeding wheel, the main stripping wheel, the nail-tooth re-stripping wheel and the grass cutting wheel are arranged in steps in sequence, which can Make the material move more smoothly in the threshing and separating device.

2. The feeding primary take-off wheel adopts flat feeding teeth, which can improve the feeding effect of rapeseed, and has an impact on rapeseed to make the rape pods crack; The rubbing effect between the pod and the pod and other parts makes the rapeseeds fall out of the pods smoothly, which can not only ensure a high cleaning rate, but also reduce the damage of the seeds and the grain The diameter of the rod-type main take-off wheel is larger, which can increase the effect of threshing and separation; the nail-tooth re-threshing wheel adopts the nail-tooth type threshing method, which can be used for threshing difficult rapeseed, and it is used in conjunction with the re-removal punching gravure , can improve the separation effect and reduce power consumption; the straw crushing device is equipped with a fixed knife assembly under the grass cutting wheel, which can be used in conjunction with the grass cutting wheel to make straw crushing more thoroughly.

3. The gravure gap adjustment device and entrainment loss detection device are installed, and the gravure gap can be adjusted in real time through the feedback system of the entrainment loss detection device according to the detected entrainment loss data, which improves the harvesting quality and harvesting efficiency.

Description of drawings

Fig. 1 is the structural representation that the present invention implements;

Fig. 2 is the structural representation of the plane feeding teeth of the feeding initial take-off wheel implemented by the present invention;

Fig. 3 is a threshing gap adjustment mechanism implemented by the present invention.

In the attached drawings: 1. Feed primary take-off wheel, 101. Plane feeding teeth, 2. Primary take-off grid concave plate, 3. Initial take-off top cover, 4. Striped rod type main take-off wheel, 5. Main take-off grid Concave plate, 6, main stripping top cover, 7, nail-tooth type re-snap off wheel, 8, re-slip punching concave plate, 9, re-slip top cover, 10, grass cutting wheel, 11, fixed knife, 12, cutting Wheel mounting seat, 13, throwing cover, 14, cleaning screen, 15, entrainment loss sensor, 16, sensor fixing seat, 17, concave plate gap adjustment device, 1701, support beam, 1702, push rod, 1703, roller , 1704, cam, 1705, camshaft.

Detailed ways

Embodiments of the present invention are described in detail below, examples of which are shown in the drawings, wherein the same or similar reference numerals designate the same or similar elements or elements having the same or similar functions throughout. The embodiments described below by referring to the figures are exemplary and are intended to explain the present invention and should not be construed as limiting the present invention.

In describing the present invention, it is to be understood that the terms "upper", "lower", "front", "rear", "left", "right", "top", "bottom", "inner", "outer" ” and other indicated orientations or positional relationships are based on the orientations or positional relationships shown in the accompanying drawings, which are only for the convenience of describing the present invention and simplifying the description, rather than indicating or implying that the referred device or element must have a specific orientation, with a specific configuration and operation, and therefore should not be construed as limiting the invention.

In addition, the terms "first" and "second" are used for descriptive purposes only, and cannot be interpreted as indicating or implying relative importance or implicitly specifying the quantity of indicated technical features. Thus, a feature defined as "first" and "second" may explicitly or implicitly include one or more of these features. In the description of the present invention, "plurality" means two or more, unless otherwise specifically defined.

In the present invention, unless otherwise clearly specified and limited, terms such as "installation", "connection", "connection" and "fixation" should be understood in a broad sense, for example, it can be a fixed connection or a detachable connection , or integrally connected; it may be mechanically connected or electrically connected; it may be directly connected or indirectly connected through an intermediary, and it may be the internal communication of two components. Those of ordinary skill in the art can understand the specific meanings of the above terms in the present invention according to specific situations.

In the present invention, unless otherwise clearly specified and limited, a first feature being "on" or "under" a second feature may include direct contact between the first and second features, and may also include the first and second features Not in direct contact but through another characteristic contact between them. Moreover, "above", "above" and "above" the first feature on the second feature include that the first feature is directly above and obliquely above the second feature, or simply means that the first feature is horizontally higher than the second feature. "Below", "beneath" and "under" the first feature to the second feature include that the first feature is directly below and obliquely below the second feature, or simply means that the first feature has a lower level than the second feature.

As shown in Figure 1-3, a multi-cutting flow combined rapeseed threshing separation and straw crushing integrated device mainly includes feeding primary stripping device, main stripping device, re-extracting device, straw crushing device, entrainment loss monitoring device and The concave plate gap adjustment device, the feeding and initial stripping device includes the feeding initial stripping wheel 1, the initial stripping grid concave plate 2 and the initial stripping top cover 3; the main stripping device includes the threaded rod type main stripping wheel 4, the main stripping grid The grid concave plate 5 and the main stripping top cover 6; the stripping device includes a nail-toothed stripping wheel 7, the stripping punched concave plate 8 and the stripping top cover 9; the straw crushing device includes a grass cutting wheel 10, a fixed knife 11 , cutting wheel mounting seat 12 and throwing cover 13; entrainment loss monitoring device includes entrainment loss sensor 15 and sensor holder 16; concave plate gap adjustment device 17 includes support beam 1701, push rod 1702, roller 1703, cam 1704 and cam Shaft 1705. The initial stripping device, the main stripping device, the re-extracting device and the straw crushing device are arranged in a ladder shape. The height of the roller shaft of each device is from low to high. The grass is fed into the grass inlet, and then passes through the initial stripping device, the main stripping device, the re-stripping device and the straw crushing device, and finally is discharged through the grass discharge port.

More specifically, the diameter of feeding primary take-off wheel 1 is 400-450mm, the diameter of threaded rod-type main take-off wheel 4 is 500-600mm, the diameter of nail-toothed re-take-off wheel 7 is 400-450mm, and the diameter of grass cutting wheel 10 is 300mm. ~360mm, the length of the four axles is the same, all are 600~1000mm; The center of gravity is 140-180mm higher than the axis of the main stripping wheel 4, the grass cutting wheel 10 is 80-120mm higher than the axis of the nail-toothed re-extracting wheel 7; 750~850r/min, the rotating speed of the threaded rod type main take-off wheel 4 is 600~700 r/min, the rotating speed of the nail-tooth type re-removing wheel 7 is 900~1000 r/min, and the rotating speed of the grass cutting wheel 10 is 2600~ 2800 r/min; the feeding primary stripping wheel 1 adopts plane feeding teeth 101, the tooth height is 35~45mm, the tooth width is 30~40mm, and the axial grid spacing of the primary stripping grid concave plate 2 is 14~18mm; The main take-off wheel 4 adopts 8 rows of evenly distributed grain rods, the width of the grain bars is 35~45mm, and the axial grid spacing of the main take-off grid concave plate 5 is 17~20mm; The nail-toothed threshing element of 80mm, and the punching hole of the punching concave plate 8 is a rectangular hole of 18 * 18mm.

Rapeseed passes through the grass inlet and enters the rotating feeding primary stripping wheel 1. The rape pods are cracked by the impact of the plane feeding teeth 101, and the seeds that are easy to fall off are separated from the primary stripping; Throwing the grain bar type main take-off wheel 4, due to the impact of the feeding primary take-off wheel 1, most of the fruit pods are cracked, so under the rubbing action between the threshing element and the fruit pods and between the fruit pods and other parts , so that the rapeseeds can be smoothly detached from the rapeseed pods, which can not only ensure a high removal rate, but also reduce the damage of the seeds; then the remaining part of the hard-to-remove seeds and straws are thrown to the nail-toothed re-removal Wheel 7, the re-extraction wheel adopts the nail-tooth threshing method, which has a better threshing effect on the difficult-to-remove rapeseed, and is used in conjunction with the re-extraction punching gravure to improve the separation effect and reduce power consumption; finally, the stalks enter high-speed rotation The unique straw crushing device crushes the straw under the cooperation of the grass cutting wheel 10 and the fixed knife 11 and discharges it from the grass outlet, completing the whole process of threshing and separating rapeseed.

The specific implementation process of the intelligent adjustment of the threshing gravure gap is as follows: the entrainment loss sensor 15 adopts an array type PVDF entrainment loss sensor, and the monitoring area of the entrainment loss sensor 15 is, from the geometric center of the entrainment loss sensor 15 to the vertical distance between the spike-tooth re-take-off wheel 7 The distance between the center plane is 180-200 mm, the distance between the upper surface of the entrainment loss sensor 15 and the bottom surface of the re-off punching concave plate 8 is 70-100 mm, and the axial installation position of the entrainment loss sensor 15 is on the back-off punching concave plate 8 in the middle; the entrainment loss sensor 15 is installed on the sensor holder 16, and the sensor holder 16 is installed on the back-off punching concave plate 8;

The gravure gap adjustment device is installed at the tail of the back-off punching concave plate 8, one end of the support beam 1701 is welded together with the back-off punching concave plate 8, and one end is welded together with the push rod 1702, and the push rod 1702 and the roller 1703 Hinged together, the roller 1703 rotates in the raceway of the cam 1704, and the cam 1704 drives the camshaft 1705 to rotate through the frequency conversion motor, thereby driving the push rod to move up and down to adjust the gap between the threshing concave plates.

The gravure clearance of the re-trip punching concave plate 8 can be adjusted through the feedback system of the entrainment loss monitoring device. The working steps of the feedback system of the entrainment loss monitoring device are as follows:

Step 1: Feed the rapeseed into the multi-cut flow combined rapeseed threshing separation and straw crushing integrated device, record the threshing gap as , the mass of entrainment loss after threshing and separation is , and the mass of grains falling on the entrainment loss detection device is , as the test Number of times, to obtain the relationship between the threshing gap of the combine harvester threshing separation device and the entrainment loss mass after threshing separation: , to establish the relationship between the grain amount in the monitoring area and the total entrainment loss during threshing separation: .

Step 2: Simultaneously, and three mathematical models, the relationship between the monitoring amount of the entrainment loss sensor and the threshing gap can be obtained during threshing separation.

Step 3: Determine the appropriate monitoring amount of the grain entrainment loss monitoring sensor during threshing separation, obtain the corresponding threshing gap according to the formula obtained in step 2, and adjust the threshing gap.

This type of multi-cut flow combined rapeseed threshing separation and straw crushing integrated device, according to the material characteristics of rapeseed, performs multi-stage cut-flow combined threshing mode on rapeseed, and reasonably arranges the positional relationship between the devices so that the crops Smooth movement; choosing the appropriate threshing form and gravure form for materials in different states can not only ensure the effect of threshing and separation, but also reduce the broken rate and power consumption; through the feedback system of the entrainment loss detection device and the threshing gravure gap adjustment device The function of the gravure threshing gap can be adjusted in real time, which improves the harvesting quality and harvesting efficiency.

In the description of this specification, descriptions referring to the terms "one embodiment", "some embodiments", "example", "specific examples", or "some examples" mean that specific features described in connection with the embodiment or example , structure, material or characteristic is included in at least one embodiment or example of the present invention. In this specification, schematic representations of the above terms do not necessarily refer to the same embodiment or example. Furthermore, the specific features, structures, materials or characteristics described may be combined in any suitable manner in any one or more embodiments or examples.

Although the embodiments of the present invention have been shown and described above, it can be understood that the above embodiments are exemplary and cannot be construed as limitations to the present invention. Variations, modifications, substitutions, and modifications to the above-described embodiments are possible within the scope of the present invention.

Claims (8)

1. A multi-cut flow combined rapeseed threshing separation and straw crushing integrated device, characterized in that it includes a feeding initial removal device, a main removal device and a re-extraction device, and the feeding initial removal device includes a feeding initial removal device wheel (1), the main take-off device includes a threaded rod-type main take-off wheel (4), the re-take-off device includes a nail-toothed re-take-off wheel (7), and the feeding initial take-off wheel (1), threaded rod The type main take-off wheel (4) and the nail-tooth type re-take off wheel (7) are arranged in a ladder shape. 2. A multi-cut flow combined rapeseed threshing separation and straw crushing integrated device according to claim 1, characterized in that it also includes a straw crushing device, and the straw crushing device includes a grass cutting wheel (10), The axis center of the threaded bar type main take-off wheel (4) is 120~150mm higher than that of the feeding primary take-off wheel (1), and the axis center of the nail-tooth type re-taken off wheel (7) is higher than that of the threaded bar type main take-off wheel ( 4) The axis of the grass cutting wheel (10) is 140-180 mm, and the axis of the grass cutting wheel (10) is higher than the axis of the nail-toothed re-take-off wheel (7) 80-120 mm. 3. A multi-cut flow combined rapeseed threshing separation and straw crushing integrated device according to claim 2, characterized in that, the diameter of the feeding primary detaching wheel (1) is 400-450 mm, and the grain rod The diameter of the type main take-off wheel (4) is 500-600mm, the diameter of the nail-tooth type re-take-off wheel (7) is 400-450mm, the diameter of the grass cutting wheel (10) is 300-360mm, and the four axles The same length, are 600 ~ 1000mm. 4. A multi-cut flow combined rapeseed threshing separation and straw crushing integrated device according to claim 2, characterized in that, the feeding primary detachment wheel (1) includes plane feeding teeth (101) with a tooth height of 35 ~45mm, tooth width 30~40mm, the axial grid spacing of the initial stripping grid concave plate (2) is 14~18mm; the main stripping wheel (4) includes 8 rows of evenly distributed stripping strips, and the stripping strip width is 35mm ~45mm, the axial grid spacing of the main stripping grid concave plate (5) is 17~20mm; the nail-tooth type re-extraction wheel (7) includes a nail-toothed threshing element with a tooth height of 70-80mm, and the re-extraction punching concave plate (8) The punching hole is a rectangular hole of 18×18mm. 5. A multi-cut flow combined rapeseed threshing separation and straw crushing integrated device according to claim 2, characterized in that the rotating speed of the feeding primary detaching wheel (1) is 750~850r/min, and the rod type The rotating speed of the main take-off wheel (4) is 600-700 r/min, the rotating speed of the nail-toothed re-take-off wheel (7) is 900-1000 r/min, and the rotating speed of the grass cutting wheel (10) is 2600-2800 r/min min. 6. A multi-cut flow combined rapeseed threshing separation and straw crushing integrated device according to any one of claims 1-5, characterized in that it also includes an entrainment loss monitoring device, and the entrainment loss monitoring The device includes an entrainment loss sensor (15) and a sensor fixing base (16), the entrainment loss sensor (15) is installed on the sensor fixing base (16), and the sensor fixing base (16) is installed on the back-off punching concave plate (8), the entrainment loss sensor (15) adopts an array PVDF entrainment loss sensor, and the monitoring area of the entrainment loss sensor (15) is from the geometric center of the entrainment loss sensor (15) to the nail tooth The distance between the vertical center plane of the type retake wheel (7) is 180-200mm, and the distance from the upper surface of the entrainment loss sensor (15) to the bottom surface of the retake-off punching concave plate (8) is 70-100mm , the axial installation position of the entrainment loss sensor (15) is in the middle of the back-off punching concave plate (8); 7. A multi-cut flow combined rapeseed threshing separation and straw crushing integrated device according to claim 6, characterized in that it also includes a gravure gap adjustment device (17), and the entrainment loss monitoring device includes an entrainment loss sensor (15) and sensor holder (16), the intaglio gap adjustment device (17) includes a support beam (1701), a push rod (1702), a roller (1703), a cam (1704) and a camshaft (1705), The gravure gap adjustment device is installed at the tail of the back-off punching concave plate (8), one end of the support beam (1701) is welded together with the back-off punching concave plate (8), and the other end is welded together with the push rod (1702) , the push rod (1702) and the roller (1703) are hinged together, the roller (1703) rotates in the raceway of the cam (1704), and the cam (1704) drives the camshaft (1705) to rotate through the frequency conversion motor, thereby driving the push rod Move up and down to adjust the gap between the threshing concave plates. 8. The gap adjustment method of a multi-cut flow combined rapeseed threshing separation and straw crushing integrated device according to claim 7, characterized in that: through the feedback system of the entrainment loss monitoring device, the re-detached punching concave plate ( 8) The intaglio gap is adjusted, and the working steps of the feedback system of the entrainment loss monitoring device are as follows: Step 1: Feed rapeseed into the multi-cut flow combined rapeseed threshing separation and straw crushing integrated device described in claims 1 to 7, record the threshing gap as , the entrainment loss after threshing and separation is , and fall on the entrainment loss detection device The grain quality above is, is the number of experiments, and the relationship between the threshing gap of the threshing separation device of the combine harvester and the entrainment loss mass after threshing separation is obtained: Establish the relationship between the grain amount in the monitoring area and the total entrainment loss grain amount during threshing separation Relationship:; Step 2: Simultaneously, and three mathematical models, the relationship between the monitoring amount of the entrainment loss sensor and the threshing gap can be obtained during threshing separation; Step 3: Determine the appropriate monitoring amount of the grain entrainment loss monitoring sensor during threshing separation, obtain the corresponding threshing gap according to the formula obtained in step 2, and adjust the threshing gap.